Improvement in hot-blast furnaces



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Letters Patent N0. 101,223, :lated March 29, 1870.

IMPROVEMENT IN HOT-BLAST FURNACES.'

The Schedule referred to in these Letters Patent and making part of the saine.

To'all whom et may concern.' v

Be it known that I, A. BURTENSHAW, of Hope Furnace, in. the county of Vinton and State of Ohio,

have invented a new and useful Improvement in Hotblast Furnaces; and I do hereby declare that the following is a full, clear, and exact description thereof, which wilL enable others skilled in the art to make and nsejthe same, reference being had to the accompanying drawings forming part of this specificationr The object of this invention is to provide a more durable construction. and improved arrangement of what are known as ring hot-blast furnaces.

It is also designed to provide an arrangement whereby repairs may be Imore easily made, and old and worn out rings may be removed.

rlhe invention also comprises an air-heating chest and throat of improved construction.

'Figure l'represents an' elevation, partly in section Figure 2 represents a horizontal section on the line x x of fig, 1;

Figurei representsa horizontal. section on the line .'l y;

Figures 4, 4, and 5, represent detail views; and

Figure represents, in perspective, partly sectioned, my improved air-chest and throat.

Similar letters of reference indicate corresponding parts.

I propose to build the stacks A andI S, also the rings B, in sections, and to so arrange the same that any ring may be separately removed for the substitu tion of others, or for repairs. i

T o this end I first place a metal ring, O, at the base, and -on this I erect two metalposts, I), on opposite sides, with tenons engaging mortises in the said rings.

These posts have-at suitable intervals recesses E, for the reception of -the hollow trunnions F of the rings. The said recesses have passages leading to them from the edges ofthe lposts, inclining downward to permit of inserting or removing the rings without .disturbing the posts. This base-ring is provided with a circular central opening, and the exterior may be either circular or poly-sided.,

' The first section G of the stack, which is similarly shaped, extends from this base to the point H, where another ring, C', is placed..

This ring rests on brackets I, riveted to the outside of the posts D, which pass through vmort'isesin the and passing out at the opposite side, where it `connects, by a similar returngbeml, B, with the next ring above, andvso ou for as many rings as it may he required to employ. In a stack where the necks K of these rings passthrongh the walls, they maybe provided with bearings L, such as represented in ig. 5, having hat bases a,`to rest on the walls, and circular Arings b, with large 'openings forthe necks K, which should iit the said openings snugly. Theserings serve to support the arches of the walls to be built over the necks of the rings, and thereby protect them.

VIn this example the second section G of the wall extends from H1 to H2, where another plate, O2, is placed. This latter, coveringvthe top of the stack-wall, receives tenons on the upper ends of the posts I). These posts may be either wholly Within the walls, or `they may be bedded on the inside thereof for protection againstl the heat.

"lhe return-bends joining the necks of the rings are I clampedup to the ends of the necks by yokes or clevis'es M, the pins of which take around plates N, interposed bet-ween the necks ofthe two rings tobeunited, and so held by flanges or projections on the said necks 'as to withstand the lateral strain of set-screws O in the outer parts of the yokes, which take around the said returnbends, as clearly shown in the drawings. The'said bends are thus clamped upto the ends of the rings in a manner that admits of the ready removal of the-said bends.

The receiving ends of these rings are provided with dividing- Tates d), which divide the blast and cause it lto.,pass equally both ways through the circular parts.

Q represents hoods for the protection of these bends, which project through the sides of the stacks.

To removeany ring B, the section of the stack between the rings C, Gl, or C2 confining the said ring may be removed, the part of the stack above being supported on the ling Cl or C2.

lo further economize the heat, I make the stacks in two or more divisions, side by side, one division taking the burning gases at the bottom from the top of the other, the said gases being conveyed laterally from' the one to the other, first being acted on by4 reectingdomes at the tops' of the divisions from which they are passing, each division being vsimilarly provided with heating-rings, which are thus more intensely acted upo'n by the heat than where all the rings are placed in a single straight stack, through which the heat escapes more rapidly.

'R represents the reflectingfdome of the rst division, by which the heat rays are thrown back upon the rings to a great/extent. I

S represents the second division, the foundation of which extends to S', as high as the top of the rst division. From this point upward is asimilar constructionand arrangement of heating-rings. 'y v '1 represents the pipe-connection betweenthe, rings of the one and. the other.

In this example only-two divisions are shown.

As another method of economiz'ing thelieat, I provide a reflecting-dome, R, on the top of the last d ivision, and convey the heat or gases therefrom in a lateral direction to the final discharging-Hue, as shownyfirst division of the stack an air-heating chamber or throat, B2, arranged in. the following way:

l. make top and bottom plates Al A of hollow cast metal, also Asides A* A in a similar` way.`

Theside Ahas a horizontal partition, a,'receiving l hole a, and discharging-hole a5.

These sides are arranged vertically between the base A2 and top A, and circular passages, provided with thimbles a, are made in the said bottom and top, and iu the ends coinciding therewith, making a continuous passage from the receiving-hole, around the throat, to the discharging-hole e, where the pipefconnection B jof the rings B is made. a

Thereceiving-hole a is connected-v with the fan or other blowing device, andthe cold air is passed through this air-heating chamber at the commencement of the heating process. s

rlhis apparatus performs three otiices: iirst, assisting to heat the air; second, acting as au ainchamber to regulate the blast; and, third, preserving the tire- A throat against the action of the heat thereon.

l am aware that a patent for a blast-furnace was granted to 1. and 1t. Hoop on the 27th of October,

1868, and all devices therein shown I wish tovdistinctly disclaim as partof my iiivention.

Having thus described my invention,

I claim as new and desire to secure by Letters Patentl 1..,Afurnace-stacl formed in sections with the intermediate parts independently supported, so that any one may be separately removed.

2. A furnace-pipe to transmit hotair, composed of horizontal and curved sections, as shown and described.

3. The combination in a hot-blast furnace of a heating-throat, reiecting-domes, and successive stacks, all co-operating to intensify the heat of the blast in the manner described.

4.` Sustainingthe hot-air pipe firmly but detachably.

by means ofttrunnions F and post D, having o pen inclined recesses E therein, as shown and described.

1,5. Supporting thc sections of a furnace-stack by ner described.

A'. BURTENSHAW.

Witnesses:

WILLIAM MARK,

SELDEN S. COOKE, H. C. JONES. 

